Radiotube



. 1,631,035 May 1927' H. K. HUPPERT RADIOTUBE Filed Dec.=21,. 1925 '2 sn ts-sneet. 1

A TTORNEY May 31,1927. a 7 I 133 035 H. K. HUPPERT RADIOTUBE Filed Dec. 21. 1925 2 Shegts-Sheeti' INVENTOR.

HENRY K HUPPERT TORNEY which will be relativel latented May 31,1927.-

U 1,631,035 UNITED STATES PATENT. OFFICE.

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-App1ieatlon filed December 531, 1925. Serial Io. 76,820.

This invention relates to improvements in radio tubes and has particular reference to a tube adapted to be employed in. any radio receiving circuit, in-which an ordinary tube is employed. 7 r

The principal objectof this invention ,is

to produce a tube wherein the loss of en-' ergy within the tube will be greatly reduced.

Another object is to produce a tube wherein self-oscillation may be eliminated.

Anadditional object is to roduce a tube stab e. I Otherobjects and a vantages will be aparent during the course of the following escription.

In the accompanying drawin s formin a part of this specification, an in whic like numerals are employed to designate like'parts throughout the same,

Figure I is a side elevatlon of my 1mproved tube,

Figure II is a fragmentary deta1l view showing the positioning of the four-elements within my'tube, Z

.Figure III is an enlarged detail cross section taken on the line 33 of Figure II,

Figure IV is a schematic diagram showmg my four-element tube employed as a detector,

V is a schematic diagram showing Figure my our-element tube so connected as to, function as a radio and audio frequencytube, and

Figure VI is a schematic diagram showing my'four-element tube in an audio frequency circuit, operating as a push-pull amplifier.

Vacuum tubes, as now used in radio reception, have a great many limitations, some of which are the large loss of energy within the tube and self-oscillation due to capacity effects between the electrodes and the limited grid control.

'I have, therefore, sought to produce a new tube having a fourth element therein,

which is so situated and so connected as to be, at all times, of an opposite polarity to the usual grid and so.spaced that the ,fila mentwill be interposed between this fourthelement and the usual grid.

In the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates the vacuum receptacle having a base 6 and the usual connecting prongs 7. W1thm thls vacuum receptacle is positioned a support 8 having the elements supported thereon.

at 9 I have shown the customary late which may consist of two halves as s own in Figure III, crimped together or may be the tubular form commonly found in the smaller tubes.

At 11, I have shown the ordinary grid which is mounted upon 'the support 8,

while at 12 I have shown the customary filament also mounted u on the support 8 and at 14 I have shown a ourth element takmg the form of a triangular plate. This fourth. element has-its major portion parallel to the plate 9, as will be seen by viewing Fi ure III.

y again viewing Figure I, it will be noted that a fifth prong 10 is positioned in the base, which pron is electrically connected to the fourth e ement 14. p

In Figure IV, I have shown a tube having a fourth element, which fourth element is connected to one 'side of the energizing coil 16 by a.wire 18 the opposite end: 0 which coil is connected to the grid 11 of the tube by a wire 17. It is, of course, understood that'this coil may be energized in any suitable manner. The A battery one-halfof the impressed. cyc e.

In the four-element tube when the grid is charged with a negative potential, the

fourth element will then be charged positively and from the same source of energy, with a result that when a negative charge is placed upon the grid which is interposed between the filament and'the plate there will be no electron flow from the filament to the plate, due to the negative charge upon the Should any electrons leave the filament whichv is the case in noisy tubes, then the electrons will be attracted to the fourth element which has a positive charge on it,

'with the reverse impulse the grid becoming positive and the fourth element negative,

the electrons are permitted to flow from the filament to the plate. This action-is accelerated due to the negative charge of the fourth element, which beingof the same polarity as the electrons, repells them and hurries their way toward the late. This action 'ves them ter centre or am hfi- Fi four e iement tube so connected as to function both as a radio and audio frequency tube.

The fourth-element being connected to the plate circuit clozfiles the audio irequeney back to the 'o frequency, thus givingnglreater' amlification.

It be me 7 y observed that the capacity efiect between the grid-and the plate 1s now as the same is in series with the fourth element, thus creating greater radio frequency efliciency and at the same time stabilizing oscillation.

In Figure VI, I have shown the tube connected in sucha manner that it will function asa push-pull amplifier and by.connecting the fourth-element to one end of the transformer coil,the other end of the coil to the grid and one side of the filament to the middle point of the transformer, the tube will function as a push-pull as herein illustrated.

It is to be understood that'theform of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes 1n the shape, size and arrangement of parts may be resorted towithout departing from thespirit of the invention or the scope of the sulli 'ioinedclaim.

aving thus described my invention, I

claim In a radio tube having an evacuated chamber, a plateelement posltioned in said cham-\ her, a filament element positioned within said chamber, a grid element interposed between said filament and said plate, and a fourth-element positioned within said tube in such'a. manner as to have its margins sub- 7 stantially surrounded by said filament.

In testimony whereof I aflix my signature.

HENRY K. HUPPERT. 

